Big change in peak frequency with different amp?

[dcbangrr9319 10+ year member]

I currently have 2 dc level 4/5 18s in my car in 6.75ft3 boxes tuned at 32 hz. I have recently run into the problem that when i switched out the ap 1500.1 amp i was using temporarily with my crunch gp3k pro, my peak frequency completely changed. With the 1500, the system peaked at 38-40 hz. With the crunch, its now about 45-48 hz, and it likes the lows less than with the 1500 even though theyre recieving twice the power. Is this something that can be fixed with the settings? or what could have caused this? thanks.

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[dcbangrr9319 10+ year member]

Anyone have any ideas? i played with some of the amp settings today, and it made a small difference, but its still sounds like the box is tuned higher or something. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[ascitiesburn69 10+ year member]

probably have your subsonic filter higher on crunch amp.